Thu, 22 May 2014 15:52:41 -0400
8037816: Fix for 8036122 breaks build with Xcode5/clang
8043029: Change 8037816 breaks HS build with older GCC versions which don't support diagnostic pragmas
8043164: Format warning in traceStream.hpp
Summary: Backport of main fix + two corrections, enables clang compilation, turns on format attributes, corrects/mutes warnings
Reviewed-by: kvn, coleenp, iveresov, twisti
duke@435 | 1 | /* |
drchase@6680 | 2 | * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "memory/allocation.hpp" |
stefank@2314 | 27 | #include "memory/allocation.inline.hpp" |
stefank@2314 | 28 | #include "runtime/os.hpp" |
stefank@2314 | 29 | #include "utilities/workgroup.hpp" |
duke@435 | 30 | |
drchase@6680 | 31 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
drchase@6680 | 32 | |
duke@435 | 33 | // Definitions of WorkGang methods. |
duke@435 | 34 | |
duke@435 | 35 | AbstractWorkGang::AbstractWorkGang(const char* name, |
ysr@777 | 36 | bool are_GC_task_threads, |
ysr@777 | 37 | bool are_ConcurrentGC_threads) : |
duke@435 | 38 | _name(name), |
ysr@777 | 39 | _are_GC_task_threads(are_GC_task_threads), |
ysr@777 | 40 | _are_ConcurrentGC_threads(are_ConcurrentGC_threads) { |
ysr@777 | 41 | |
ysr@777 | 42 | assert(!(are_GC_task_threads && are_ConcurrentGC_threads), |
ysr@777 | 43 | "They cannot both be STW GC and Concurrent threads" ); |
ysr@777 | 44 | |
duke@435 | 45 | // Other initialization. |
duke@435 | 46 | _monitor = new Monitor(/* priority */ Mutex::leaf, |
duke@435 | 47 | /* name */ "WorkGroup monitor", |
ysr@777 | 48 | /* allow_vm_block */ are_GC_task_threads); |
duke@435 | 49 | assert(monitor() != NULL, "Failed to allocate monitor"); |
duke@435 | 50 | _terminate = false; |
duke@435 | 51 | _task = NULL; |
duke@435 | 52 | _sequence_number = 0; |
duke@435 | 53 | _started_workers = 0; |
duke@435 | 54 | _finished_workers = 0; |
duke@435 | 55 | } |
duke@435 | 56 | |
duke@435 | 57 | WorkGang::WorkGang(const char* name, |
jmasa@3357 | 58 | uint workers, |
ysr@777 | 59 | bool are_GC_task_threads, |
ysr@777 | 60 | bool are_ConcurrentGC_threads) : |
jmasa@2188 | 61 | AbstractWorkGang(name, are_GC_task_threads, are_ConcurrentGC_threads) { |
duke@435 | 62 | _total_workers = workers; |
jmasa@2188 | 63 | } |
jmasa@2188 | 64 | |
jmasa@3357 | 65 | GangWorker* WorkGang::allocate_worker(uint which) { |
jmasa@2188 | 66 | GangWorker* new_worker = new GangWorker(this, which); |
jmasa@2188 | 67 | return new_worker; |
jmasa@2188 | 68 | } |
jmasa@2188 | 69 | |
jmasa@2188 | 70 | // The current implementation will exit if the allocation |
jmasa@2188 | 71 | // of any worker fails. Still, return a boolean so that |
jmasa@2188 | 72 | // a future implementation can possibly do a partial |
jmasa@2188 | 73 | // initialization of the workers and report such to the |
jmasa@2188 | 74 | // caller. |
jmasa@2188 | 75 | bool WorkGang::initialize_workers() { |
ysr@777 | 76 | |
duke@435 | 77 | if (TraceWorkGang) { |
jmasa@2188 | 78 | tty->print_cr("Constructing work gang %s with %d threads", |
jmasa@2188 | 79 | name(), |
jmasa@2188 | 80 | total_workers()); |
duke@435 | 81 | } |
zgu@3900 | 82 | _gang_workers = NEW_C_HEAP_ARRAY(GangWorker*, total_workers(), mtInternal); |
ysr@777 | 83 | if (gang_workers() == NULL) { |
ccheung@4993 | 84 | vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GangWorker array."); |
jmasa@2188 | 85 | return false; |
jmasa@2188 | 86 | } |
jmasa@2188 | 87 | os::ThreadType worker_type; |
jmasa@2188 | 88 | if (are_ConcurrentGC_threads()) { |
jmasa@2188 | 89 | worker_type = os::cgc_thread; |
jmasa@2188 | 90 | } else { |
jmasa@2188 | 91 | worker_type = os::pgc_thread; |
ysr@777 | 92 | } |
jmasa@3357 | 93 | for (uint worker = 0; worker < total_workers(); worker += 1) { |
jmasa@2188 | 94 | GangWorker* new_worker = allocate_worker(worker); |
duke@435 | 95 | assert(new_worker != NULL, "Failed to allocate GangWorker"); |
duke@435 | 96 | _gang_workers[worker] = new_worker; |
jmasa@2188 | 97 | if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) { |
ccheung@4993 | 98 | vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, |
ccheung@4993 | 99 | "Cannot create worker GC thread. Out of system resources."); |
jmasa@2188 | 100 | return false; |
jmasa@2188 | 101 | } |
duke@435 | 102 | if (!DisableStartThread) { |
duke@435 | 103 | os::start_thread(new_worker); |
duke@435 | 104 | } |
duke@435 | 105 | } |
jmasa@2188 | 106 | return true; |
duke@435 | 107 | } |
duke@435 | 108 | |
duke@435 | 109 | AbstractWorkGang::~AbstractWorkGang() { |
duke@435 | 110 | if (TraceWorkGang) { |
duke@435 | 111 | tty->print_cr("Destructing work gang %s", name()); |
duke@435 | 112 | } |
duke@435 | 113 | stop(); // stop all the workers |
jmasa@3357 | 114 | for (uint worker = 0; worker < total_workers(); worker += 1) { |
duke@435 | 115 | delete gang_worker(worker); |
duke@435 | 116 | } |
duke@435 | 117 | delete gang_workers(); |
duke@435 | 118 | delete monitor(); |
duke@435 | 119 | } |
duke@435 | 120 | |
jmasa@3357 | 121 | GangWorker* AbstractWorkGang::gang_worker(uint i) const { |
duke@435 | 122 | // Array index bounds checking. |
duke@435 | 123 | GangWorker* result = NULL; |
duke@435 | 124 | assert(gang_workers() != NULL, "No workers for indexing"); |
duke@435 | 125 | assert(((i >= 0) && (i < total_workers())), "Worker index out of bounds"); |
duke@435 | 126 | result = _gang_workers[i]; |
duke@435 | 127 | assert(result != NULL, "Indexing to null worker"); |
duke@435 | 128 | return result; |
duke@435 | 129 | } |
duke@435 | 130 | |
duke@435 | 131 | void WorkGang::run_task(AbstractGangTask* task) { |
jmasa@3294 | 132 | run_task(task, total_workers()); |
jmasa@3294 | 133 | } |
jmasa@3294 | 134 | |
jmasa@3294 | 135 | void WorkGang::run_task(AbstractGangTask* task, uint no_of_parallel_workers) { |
jmasa@3294 | 136 | task->set_for_termination(no_of_parallel_workers); |
jmasa@3294 | 137 | |
duke@435 | 138 | // This thread is executed by the VM thread which does not block |
duke@435 | 139 | // on ordinary MutexLocker's. |
duke@435 | 140 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
duke@435 | 141 | if (TraceWorkGang) { |
duke@435 | 142 | tty->print_cr("Running work gang %s task %s", name(), task->name()); |
duke@435 | 143 | } |
duke@435 | 144 | // Tell all the workers to run a task. |
duke@435 | 145 | assert(task != NULL, "Running a null task"); |
duke@435 | 146 | // Initialize. |
duke@435 | 147 | _task = task; |
duke@435 | 148 | _sequence_number += 1; |
duke@435 | 149 | _started_workers = 0; |
duke@435 | 150 | _finished_workers = 0; |
duke@435 | 151 | // Tell the workers to get to work. |
duke@435 | 152 | monitor()->notify_all(); |
duke@435 | 153 | // Wait for them to be finished |
jmasa@3357 | 154 | while (finished_workers() < no_of_parallel_workers) { |
duke@435 | 155 | if (TraceWorkGang) { |
duke@435 | 156 | tty->print_cr("Waiting in work gang %s: %d/%d finished sequence %d", |
jmasa@3294 | 157 | name(), finished_workers(), no_of_parallel_workers, |
duke@435 | 158 | _sequence_number); |
duke@435 | 159 | } |
duke@435 | 160 | monitor()->wait(/* no_safepoint_check */ true); |
duke@435 | 161 | } |
duke@435 | 162 | _task = NULL; |
duke@435 | 163 | if (TraceWorkGang) { |
jmasa@3294 | 164 | tty->print_cr("\nFinished work gang %s: %d/%d sequence %d", |
jmasa@3294 | 165 | name(), finished_workers(), no_of_parallel_workers, |
duke@435 | 166 | _sequence_number); |
jmasa@3294 | 167 | Thread* me = Thread::current(); |
jmasa@3294 | 168 | tty->print_cr(" T: 0x%x VM_thread: %d", me, me->is_VM_thread()); |
ysr@2651 | 169 | } |
duke@435 | 170 | } |
duke@435 | 171 | |
jmasa@3294 | 172 | void FlexibleWorkGang::run_task(AbstractGangTask* task) { |
jmasa@3294 | 173 | // If active_workers() is passed, _finished_workers |
jmasa@3294 | 174 | // must only be incremented for workers that find non_null |
jmasa@3294 | 175 | // work (as opposed to all those that just check that the |
jmasa@3294 | 176 | // task is not null). |
jmasa@3294 | 177 | WorkGang::run_task(task, (uint) active_workers()); |
jmasa@3294 | 178 | } |
jmasa@3294 | 179 | |
duke@435 | 180 | void AbstractWorkGang::stop() { |
duke@435 | 181 | // Tell all workers to terminate, then wait for them to become inactive. |
duke@435 | 182 | MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
duke@435 | 183 | if (TraceWorkGang) { |
duke@435 | 184 | tty->print_cr("Stopping work gang %s task %s", name(), task()->name()); |
duke@435 | 185 | } |
duke@435 | 186 | _task = NULL; |
duke@435 | 187 | _terminate = true; |
duke@435 | 188 | monitor()->notify_all(); |
jmasa@3294 | 189 | while (finished_workers() < active_workers()) { |
duke@435 | 190 | if (TraceWorkGang) { |
duke@435 | 191 | tty->print_cr("Waiting in work gang %s: %d/%d finished", |
jmasa@3294 | 192 | name(), finished_workers(), active_workers()); |
duke@435 | 193 | } |
duke@435 | 194 | monitor()->wait(/* no_safepoint_check */ true); |
duke@435 | 195 | } |
duke@435 | 196 | } |
duke@435 | 197 | |
duke@435 | 198 | void AbstractWorkGang::internal_worker_poll(WorkData* data) const { |
duke@435 | 199 | assert(monitor()->owned_by_self(), "worker_poll is an internal method"); |
duke@435 | 200 | assert(data != NULL, "worker data is null"); |
duke@435 | 201 | data->set_terminate(terminate()); |
duke@435 | 202 | data->set_task(task()); |
duke@435 | 203 | data->set_sequence_number(sequence_number()); |
duke@435 | 204 | } |
duke@435 | 205 | |
duke@435 | 206 | void AbstractWorkGang::internal_note_start() { |
duke@435 | 207 | assert(monitor()->owned_by_self(), "note_finish is an internal method"); |
duke@435 | 208 | _started_workers += 1; |
duke@435 | 209 | } |
duke@435 | 210 | |
duke@435 | 211 | void AbstractWorkGang::internal_note_finish() { |
duke@435 | 212 | assert(monitor()->owned_by_self(), "note_finish is an internal method"); |
duke@435 | 213 | _finished_workers += 1; |
duke@435 | 214 | } |
duke@435 | 215 | |
duke@435 | 216 | void AbstractWorkGang::print_worker_threads_on(outputStream* st) const { |
duke@435 | 217 | uint num_thr = total_workers(); |
duke@435 | 218 | for (uint i = 0; i < num_thr; i++) { |
duke@435 | 219 | gang_worker(i)->print_on(st); |
duke@435 | 220 | st->cr(); |
duke@435 | 221 | } |
duke@435 | 222 | } |
duke@435 | 223 | |
duke@435 | 224 | void AbstractWorkGang::threads_do(ThreadClosure* tc) const { |
duke@435 | 225 | assert(tc != NULL, "Null ThreadClosure"); |
duke@435 | 226 | uint num_thr = total_workers(); |
duke@435 | 227 | for (uint i = 0; i < num_thr; i++) { |
duke@435 | 228 | tc->do_thread(gang_worker(i)); |
duke@435 | 229 | } |
duke@435 | 230 | } |
duke@435 | 231 | |
duke@435 | 232 | // GangWorker methods. |
duke@435 | 233 | |
duke@435 | 234 | GangWorker::GangWorker(AbstractWorkGang* gang, uint id) { |
duke@435 | 235 | _gang = gang; |
duke@435 | 236 | set_id(id); |
duke@435 | 237 | set_name("Gang worker#%d (%s)", id, gang->name()); |
duke@435 | 238 | } |
duke@435 | 239 | |
duke@435 | 240 | void GangWorker::run() { |
duke@435 | 241 | initialize(); |
duke@435 | 242 | loop(); |
duke@435 | 243 | } |
duke@435 | 244 | |
duke@435 | 245 | void GangWorker::initialize() { |
duke@435 | 246 | this->initialize_thread_local_storage(); |
zgu@3900 | 247 | this->record_stack_base_and_size(); |
duke@435 | 248 | assert(_gang != NULL, "No gang to run in"); |
duke@435 | 249 | os::set_priority(this, NearMaxPriority); |
duke@435 | 250 | if (TraceWorkGang) { |
duke@435 | 251 | tty->print_cr("Running gang worker for gang %s id %d", |
duke@435 | 252 | gang()->name(), id()); |
duke@435 | 253 | } |
duke@435 | 254 | // The VM thread should not execute here because MutexLocker's are used |
duke@435 | 255 | // as (opposed to MutexLockerEx's). |
duke@435 | 256 | assert(!Thread::current()->is_VM_thread(), "VM thread should not be part" |
duke@435 | 257 | " of a work gang"); |
duke@435 | 258 | } |
duke@435 | 259 | |
duke@435 | 260 | void GangWorker::loop() { |
duke@435 | 261 | int previous_sequence_number = 0; |
duke@435 | 262 | Monitor* gang_monitor = gang()->monitor(); |
duke@435 | 263 | for ( ; /* !terminate() */; ) { |
duke@435 | 264 | WorkData data; |
duke@435 | 265 | int part; // Initialized below. |
duke@435 | 266 | { |
duke@435 | 267 | // Grab the gang mutex. |
duke@435 | 268 | MutexLocker ml(gang_monitor); |
duke@435 | 269 | // Wait for something to do. |
duke@435 | 270 | // Polling outside the while { wait } avoids missed notifies |
duke@435 | 271 | // in the outer loop. |
duke@435 | 272 | gang()->internal_worker_poll(&data); |
duke@435 | 273 | if (TraceWorkGang) { |
duke@435 | 274 | tty->print("Polled outside for work in gang %s worker %d", |
duke@435 | 275 | gang()->name(), id()); |
duke@435 | 276 | tty->print(" terminate: %s", |
duke@435 | 277 | data.terminate() ? "true" : "false"); |
duke@435 | 278 | tty->print(" sequence: %d (prev: %d)", |
duke@435 | 279 | data.sequence_number(), previous_sequence_number); |
duke@435 | 280 | if (data.task() != NULL) { |
duke@435 | 281 | tty->print(" task: %s", data.task()->name()); |
duke@435 | 282 | } else { |
duke@435 | 283 | tty->print(" task: NULL"); |
duke@435 | 284 | } |
duke@435 | 285 | tty->cr(); |
duke@435 | 286 | } |
duke@435 | 287 | for ( ; /* break or return */; ) { |
duke@435 | 288 | // Terminate if requested. |
duke@435 | 289 | if (data.terminate()) { |
duke@435 | 290 | gang()->internal_note_finish(); |
duke@435 | 291 | gang_monitor->notify_all(); |
duke@435 | 292 | return; |
duke@435 | 293 | } |
duke@435 | 294 | // Check for new work. |
duke@435 | 295 | if ((data.task() != NULL) && |
duke@435 | 296 | (data.sequence_number() != previous_sequence_number)) { |
jmasa@3294 | 297 | if (gang()->needs_more_workers()) { |
jmasa@3294 | 298 | gang()->internal_note_start(); |
jmasa@3294 | 299 | gang_monitor->notify_all(); |
jmasa@3294 | 300 | part = gang()->started_workers() - 1; |
jmasa@3294 | 301 | break; |
jmasa@3294 | 302 | } |
duke@435 | 303 | } |
duke@435 | 304 | // Nothing to do. |
duke@435 | 305 | gang_monitor->wait(/* no_safepoint_check */ true); |
duke@435 | 306 | gang()->internal_worker_poll(&data); |
duke@435 | 307 | if (TraceWorkGang) { |
duke@435 | 308 | tty->print("Polled inside for work in gang %s worker %d", |
duke@435 | 309 | gang()->name(), id()); |
duke@435 | 310 | tty->print(" terminate: %s", |
duke@435 | 311 | data.terminate() ? "true" : "false"); |
duke@435 | 312 | tty->print(" sequence: %d (prev: %d)", |
duke@435 | 313 | data.sequence_number(), previous_sequence_number); |
duke@435 | 314 | if (data.task() != NULL) { |
duke@435 | 315 | tty->print(" task: %s", data.task()->name()); |
duke@435 | 316 | } else { |
duke@435 | 317 | tty->print(" task: NULL"); |
duke@435 | 318 | } |
duke@435 | 319 | tty->cr(); |
duke@435 | 320 | } |
duke@435 | 321 | } |
duke@435 | 322 | // Drop gang mutex. |
duke@435 | 323 | } |
duke@435 | 324 | if (TraceWorkGang) { |
duke@435 | 325 | tty->print("Work for work gang %s id %d task %s part %d", |
duke@435 | 326 | gang()->name(), id(), data.task()->name(), part); |
duke@435 | 327 | } |
duke@435 | 328 | assert(data.task() != NULL, "Got null task"); |
duke@435 | 329 | data.task()->work(part); |
duke@435 | 330 | { |
duke@435 | 331 | if (TraceWorkGang) { |
duke@435 | 332 | tty->print("Finish for work gang %s id %d task %s part %d", |
duke@435 | 333 | gang()->name(), id(), data.task()->name(), part); |
duke@435 | 334 | } |
duke@435 | 335 | // Grab the gang mutex. |
duke@435 | 336 | MutexLocker ml(gang_monitor); |
duke@435 | 337 | gang()->internal_note_finish(); |
duke@435 | 338 | // Tell the gang you are done. |
duke@435 | 339 | gang_monitor->notify_all(); |
duke@435 | 340 | // Drop the gang mutex. |
duke@435 | 341 | } |
duke@435 | 342 | previous_sequence_number = data.sequence_number(); |
duke@435 | 343 | } |
duke@435 | 344 | } |
duke@435 | 345 | |
duke@435 | 346 | bool GangWorker::is_GC_task_thread() const { |
ysr@777 | 347 | return gang()->are_GC_task_threads(); |
ysr@777 | 348 | } |
ysr@777 | 349 | |
ysr@777 | 350 | bool GangWorker::is_ConcurrentGC_thread() const { |
ysr@777 | 351 | return gang()->are_ConcurrentGC_threads(); |
duke@435 | 352 | } |
duke@435 | 353 | |
duke@435 | 354 | void GangWorker::print_on(outputStream* st) const { |
duke@435 | 355 | st->print("\"%s\" ", name()); |
duke@435 | 356 | Thread::print_on(st); |
duke@435 | 357 | st->cr(); |
duke@435 | 358 | } |
duke@435 | 359 | |
duke@435 | 360 | // Printing methods |
duke@435 | 361 | |
duke@435 | 362 | const char* AbstractWorkGang::name() const { |
duke@435 | 363 | return _name; |
duke@435 | 364 | } |
duke@435 | 365 | |
duke@435 | 366 | #ifndef PRODUCT |
duke@435 | 367 | |
duke@435 | 368 | const char* AbstractGangTask::name() const { |
duke@435 | 369 | return _name; |
duke@435 | 370 | } |
duke@435 | 371 | |
duke@435 | 372 | #endif /* PRODUCT */ |
duke@435 | 373 | |
jmasa@3294 | 374 | // FlexibleWorkGang |
jmasa@3294 | 375 | |
jmasa@3294 | 376 | |
duke@435 | 377 | // *** WorkGangBarrierSync |
duke@435 | 378 | |
duke@435 | 379 | WorkGangBarrierSync::WorkGangBarrierSync() |
duke@435 | 380 | : _monitor(Mutex::safepoint, "work gang barrier sync", true), |
ysr@777 | 381 | _n_workers(0), _n_completed(0), _should_reset(false) { |
duke@435 | 382 | } |
duke@435 | 383 | |
jmasa@3357 | 384 | WorkGangBarrierSync::WorkGangBarrierSync(uint n_workers, const char* name) |
duke@435 | 385 | : _monitor(Mutex::safepoint, name, true), |
ysr@777 | 386 | _n_workers(n_workers), _n_completed(0), _should_reset(false) { |
duke@435 | 387 | } |
duke@435 | 388 | |
jmasa@3357 | 389 | void WorkGangBarrierSync::set_n_workers(uint n_workers) { |
duke@435 | 390 | _n_workers = n_workers; |
duke@435 | 391 | _n_completed = 0; |
ysr@777 | 392 | _should_reset = false; |
duke@435 | 393 | } |
duke@435 | 394 | |
duke@435 | 395 | void WorkGangBarrierSync::enter() { |
duke@435 | 396 | MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag); |
ysr@777 | 397 | if (should_reset()) { |
ysr@777 | 398 | // The should_reset() was set and we are the first worker to enter |
ysr@777 | 399 | // the sync barrier. We will zero the n_completed() count which |
ysr@777 | 400 | // effectively resets the barrier. |
ysr@777 | 401 | zero_completed(); |
ysr@777 | 402 | set_should_reset(false); |
ysr@777 | 403 | } |
duke@435 | 404 | inc_completed(); |
duke@435 | 405 | if (n_completed() == n_workers()) { |
ysr@777 | 406 | // At this point we would like to reset the barrier to be ready in |
ysr@777 | 407 | // case it is used again. However, we cannot set n_completed() to |
ysr@777 | 408 | // 0, even after the notify_all(), given that some other workers |
ysr@777 | 409 | // might still be waiting for n_completed() to become == |
ysr@777 | 410 | // n_workers(). So, if we set n_completed() to 0, those workers |
ysr@777 | 411 | // will get stuck (as they will wake up, see that n_completed() != |
ysr@777 | 412 | // n_workers() and go back to sleep). Instead, we raise the |
ysr@777 | 413 | // should_reset() flag and the barrier will be reset the first |
ysr@777 | 414 | // time a worker enters it again. |
ysr@777 | 415 | set_should_reset(true); |
duke@435 | 416 | monitor()->notify_all(); |
ysr@777 | 417 | } else { |
duke@435 | 418 | while (n_completed() != n_workers()) { |
duke@435 | 419 | monitor()->wait(/* no_safepoint_check */ true); |
duke@435 | 420 | } |
duke@435 | 421 | } |
duke@435 | 422 | } |
duke@435 | 423 | |
duke@435 | 424 | // SubTasksDone functions. |
duke@435 | 425 | |
jmasa@3357 | 426 | SubTasksDone::SubTasksDone(uint n) : |
duke@435 | 427 | _n_tasks(n), _n_threads(1), _tasks(NULL) { |
zgu@3900 | 428 | _tasks = NEW_C_HEAP_ARRAY(uint, n, mtInternal); |
duke@435 | 429 | guarantee(_tasks != NULL, "alloc failure"); |
duke@435 | 430 | clear(); |
duke@435 | 431 | } |
duke@435 | 432 | |
duke@435 | 433 | bool SubTasksDone::valid() { |
duke@435 | 434 | return _tasks != NULL; |
duke@435 | 435 | } |
duke@435 | 436 | |
jmasa@3357 | 437 | void SubTasksDone::set_n_threads(uint t) { |
duke@435 | 438 | assert(_claimed == 0 || _threads_completed == _n_threads, |
duke@435 | 439 | "should not be called while tasks are being processed!"); |
duke@435 | 440 | _n_threads = (t == 0 ? 1 : t); |
duke@435 | 441 | } |
duke@435 | 442 | |
duke@435 | 443 | void SubTasksDone::clear() { |
jmasa@3357 | 444 | for (uint i = 0; i < _n_tasks; i++) { |
duke@435 | 445 | _tasks[i] = 0; |
duke@435 | 446 | } |
duke@435 | 447 | _threads_completed = 0; |
duke@435 | 448 | #ifdef ASSERT |
duke@435 | 449 | _claimed = 0; |
duke@435 | 450 | #endif |
duke@435 | 451 | } |
duke@435 | 452 | |
jmasa@3357 | 453 | bool SubTasksDone::is_task_claimed(uint t) { |
duke@435 | 454 | assert(0 <= t && t < _n_tasks, "bad task id."); |
jmasa@3357 | 455 | uint old = _tasks[t]; |
duke@435 | 456 | if (old == 0) { |
duke@435 | 457 | old = Atomic::cmpxchg(1, &_tasks[t], 0); |
duke@435 | 458 | } |
duke@435 | 459 | assert(_tasks[t] == 1, "What else?"); |
duke@435 | 460 | bool res = old != 0; |
duke@435 | 461 | #ifdef ASSERT |
duke@435 | 462 | if (!res) { |
duke@435 | 463 | assert(_claimed < _n_tasks, "Too many tasks claimed; missing clear?"); |
jmasa@3357 | 464 | Atomic::inc((volatile jint*) &_claimed); |
duke@435 | 465 | } |
duke@435 | 466 | #endif |
duke@435 | 467 | return res; |
duke@435 | 468 | } |
duke@435 | 469 | |
duke@435 | 470 | void SubTasksDone::all_tasks_completed() { |
duke@435 | 471 | jint observed = _threads_completed; |
duke@435 | 472 | jint old; |
duke@435 | 473 | do { |
duke@435 | 474 | old = observed; |
duke@435 | 475 | observed = Atomic::cmpxchg(old+1, &_threads_completed, old); |
duke@435 | 476 | } while (observed != old); |
duke@435 | 477 | // If this was the last thread checking in, clear the tasks. |
jmasa@3357 | 478 | if (observed+1 == (jint)_n_threads) clear(); |
duke@435 | 479 | } |
duke@435 | 480 | |
duke@435 | 481 | |
duke@435 | 482 | SubTasksDone::~SubTasksDone() { |
zgu@3900 | 483 | if (_tasks != NULL) FREE_C_HEAP_ARRAY(jint, _tasks, mtInternal); |
duke@435 | 484 | } |
duke@435 | 485 | |
duke@435 | 486 | // *** SequentialSubTasksDone |
duke@435 | 487 | |
duke@435 | 488 | void SequentialSubTasksDone::clear() { |
duke@435 | 489 | _n_tasks = _n_claimed = 0; |
duke@435 | 490 | _n_threads = _n_completed = 0; |
duke@435 | 491 | } |
duke@435 | 492 | |
duke@435 | 493 | bool SequentialSubTasksDone::valid() { |
duke@435 | 494 | return _n_threads > 0; |
duke@435 | 495 | } |
duke@435 | 496 | |
jmasa@3357 | 497 | bool SequentialSubTasksDone::is_task_claimed(uint& t) { |
jmasa@3357 | 498 | uint* n_claimed_ptr = &_n_claimed; |
duke@435 | 499 | t = *n_claimed_ptr; |
duke@435 | 500 | while (t < _n_tasks) { |
duke@435 | 501 | jint res = Atomic::cmpxchg(t+1, n_claimed_ptr, t); |
jmasa@3357 | 502 | if (res == (jint)t) { |
duke@435 | 503 | return false; |
duke@435 | 504 | } |
duke@435 | 505 | t = *n_claimed_ptr; |
duke@435 | 506 | } |
duke@435 | 507 | return true; |
duke@435 | 508 | } |
duke@435 | 509 | |
duke@435 | 510 | bool SequentialSubTasksDone::all_tasks_completed() { |
jmasa@3357 | 511 | uint* n_completed_ptr = &_n_completed; |
jmasa@3357 | 512 | uint complete = *n_completed_ptr; |
duke@435 | 513 | while (true) { |
jmasa@3357 | 514 | uint res = Atomic::cmpxchg(complete+1, n_completed_ptr, complete); |
duke@435 | 515 | if (res == complete) { |
duke@435 | 516 | break; |
duke@435 | 517 | } |
duke@435 | 518 | complete = res; |
duke@435 | 519 | } |
duke@435 | 520 | if (complete+1 == _n_threads) { |
duke@435 | 521 | clear(); |
duke@435 | 522 | return true; |
duke@435 | 523 | } |
duke@435 | 524 | return false; |
duke@435 | 525 | } |
ysr@777 | 526 | |
ysr@777 | 527 | bool FreeIdSet::_stat_init = false; |
ysr@777 | 528 | FreeIdSet* FreeIdSet::_sets[NSets]; |
ysr@777 | 529 | bool FreeIdSet::_safepoint; |
ysr@777 | 530 | |
ysr@777 | 531 | FreeIdSet::FreeIdSet(int sz, Monitor* mon) : |
ysr@777 | 532 | _sz(sz), _mon(mon), _hd(0), _waiters(0), _index(-1), _claimed(0) |
ysr@777 | 533 | { |
minqi@5103 | 534 | _ids = NEW_C_HEAP_ARRAY(int, sz, mtInternal); |
ysr@777 | 535 | for (int i = 0; i < sz; i++) _ids[i] = i+1; |
ysr@777 | 536 | _ids[sz-1] = end_of_list; // end of list. |
ysr@777 | 537 | if (_stat_init) { |
ysr@777 | 538 | for (int j = 0; j < NSets; j++) _sets[j] = NULL; |
ysr@777 | 539 | _stat_init = true; |
ysr@777 | 540 | } |
ysr@777 | 541 | // Add to sets. (This should happen while the system is still single-threaded.) |
ysr@777 | 542 | for (int j = 0; j < NSets; j++) { |
ysr@777 | 543 | if (_sets[j] == NULL) { |
ysr@777 | 544 | _sets[j] = this; |
ysr@777 | 545 | _index = j; |
ysr@777 | 546 | break; |
ysr@777 | 547 | } |
ysr@777 | 548 | } |
ysr@777 | 549 | guarantee(_index != -1, "Too many FreeIdSets in use!"); |
ysr@777 | 550 | } |
ysr@777 | 551 | |
ysr@777 | 552 | FreeIdSet::~FreeIdSet() { |
ysr@777 | 553 | _sets[_index] = NULL; |
minqi@5103 | 554 | FREE_C_HEAP_ARRAY(int, _ids, mtInternal); |
ysr@777 | 555 | } |
ysr@777 | 556 | |
ysr@777 | 557 | void FreeIdSet::set_safepoint(bool b) { |
ysr@777 | 558 | _safepoint = b; |
ysr@777 | 559 | if (b) { |
ysr@777 | 560 | for (int j = 0; j < NSets; j++) { |
ysr@777 | 561 | if (_sets[j] != NULL && _sets[j]->_waiters > 0) { |
ysr@777 | 562 | Monitor* mon = _sets[j]->_mon; |
ysr@777 | 563 | mon->lock_without_safepoint_check(); |
ysr@777 | 564 | mon->notify_all(); |
ysr@777 | 565 | mon->unlock(); |
ysr@777 | 566 | } |
ysr@777 | 567 | } |
ysr@777 | 568 | } |
ysr@777 | 569 | } |
ysr@777 | 570 | |
ysr@777 | 571 | #define FID_STATS 0 |
ysr@777 | 572 | |
ysr@777 | 573 | int FreeIdSet::claim_par_id() { |
ysr@777 | 574 | #if FID_STATS |
ysr@777 | 575 | thread_t tslf = thr_self(); |
ysr@777 | 576 | tty->print("claim_par_id[%d]: sz = %d, claimed = %d\n", tslf, _sz, _claimed); |
ysr@777 | 577 | #endif |
ysr@777 | 578 | MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); |
ysr@777 | 579 | while (!_safepoint && _hd == end_of_list) { |
ysr@777 | 580 | _waiters++; |
ysr@777 | 581 | #if FID_STATS |
ysr@777 | 582 | if (_waiters > 5) { |
ysr@777 | 583 | tty->print("claim_par_id waiting[%d]: %d waiters, %d claimed.\n", |
ysr@777 | 584 | tslf, _waiters, _claimed); |
ysr@777 | 585 | } |
ysr@777 | 586 | #endif |
ysr@777 | 587 | _mon->wait(Mutex::_no_safepoint_check_flag); |
ysr@777 | 588 | _waiters--; |
ysr@777 | 589 | } |
ysr@777 | 590 | if (_hd == end_of_list) { |
ysr@777 | 591 | #if FID_STATS |
ysr@777 | 592 | tty->print("claim_par_id[%d]: returning EOL.\n", tslf); |
ysr@777 | 593 | #endif |
ysr@777 | 594 | return -1; |
ysr@777 | 595 | } else { |
ysr@777 | 596 | int res = _hd; |
ysr@777 | 597 | _hd = _ids[res]; |
ysr@777 | 598 | _ids[res] = claimed; // For debugging. |
ysr@777 | 599 | _claimed++; |
ysr@777 | 600 | #if FID_STATS |
ysr@777 | 601 | tty->print("claim_par_id[%d]: returning %d, claimed = %d.\n", |
ysr@777 | 602 | tslf, res, _claimed); |
ysr@777 | 603 | #endif |
ysr@777 | 604 | return res; |
ysr@777 | 605 | } |
ysr@777 | 606 | } |
ysr@777 | 607 | |
ysr@777 | 608 | bool FreeIdSet::claim_perm_id(int i) { |
ysr@777 | 609 | assert(0 <= i && i < _sz, "Out of range."); |
ysr@777 | 610 | MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); |
ysr@777 | 611 | int prev = end_of_list; |
ysr@777 | 612 | int cur = _hd; |
ysr@777 | 613 | while (cur != end_of_list) { |
ysr@777 | 614 | if (cur == i) { |
ysr@777 | 615 | if (prev == end_of_list) { |
ysr@777 | 616 | _hd = _ids[cur]; |
ysr@777 | 617 | } else { |
ysr@777 | 618 | _ids[prev] = _ids[cur]; |
ysr@777 | 619 | } |
ysr@777 | 620 | _ids[cur] = claimed; |
ysr@777 | 621 | _claimed++; |
ysr@777 | 622 | return true; |
ysr@777 | 623 | } else { |
ysr@777 | 624 | prev = cur; |
ysr@777 | 625 | cur = _ids[cur]; |
ysr@777 | 626 | } |
ysr@777 | 627 | } |
ysr@777 | 628 | return false; |
ysr@777 | 629 | |
ysr@777 | 630 | } |
ysr@777 | 631 | |
ysr@777 | 632 | void FreeIdSet::release_par_id(int id) { |
ysr@777 | 633 | MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); |
ysr@777 | 634 | assert(_ids[id] == claimed, "Precondition."); |
ysr@777 | 635 | _ids[id] = _hd; |
ysr@777 | 636 | _hd = id; |
ysr@777 | 637 | _claimed--; |
ysr@777 | 638 | #if FID_STATS |
ysr@777 | 639 | tty->print("[%d] release_par_id(%d), waiters =%d, claimed = %d.\n", |
ysr@777 | 640 | thr_self(), id, _waiters, _claimed); |
ysr@777 | 641 | #endif |
ysr@777 | 642 | if (_waiters > 0) |
ysr@777 | 643 | // Notify all would be safer, but this is OK, right? |
ysr@777 | 644 | _mon->notify_all(); |
ysr@777 | 645 | } |